Fortran Code Guessing Game

A thinking-out-loud analysis of Fortran code. What could a programmer accustomed to various modern languages figure out about a Fortran code snippet?

In one of my recent articles, I wrote a snippet of Fortran code to argue that the programming languages of old are not that different from the ones we use today. One could guess a lot of what is written there if one has some exposure to some different languages. I am writing this for the benefit of one of my readers, Matthew, but I thought it might be of general interest. So here is the Fortran code:

function sort( array )
    real, dimension(:)           :: array
    real, dimension(size(array)) :: sort

    real                         :: temp
    integer                      :: i, j
    integer, dimension(1)        :: pos

    !
    ! Retrieve the lowest elements one by one
    !
    sort = array
    do i = 1,size(sort)
        pos     = minloc( sort(i:) )
        j       = i + pos(1) - 1
        temp    = sort(j)
        sort(j) = sort(i)
        sort(i) = temp
    enddo
end function

Without looking up anything about Fortran, I will try to guess what everything means here based on other languages I use. I promise you that I have never written a line of Fortran code in my life or ever been taught Fortran.

Start and End of Function